Key Document

Description

This reference design implements Class 0.1 split-phase energy measurement using high-performance, multi-channel analog-to-digital converters (ADC). The independent ADC samples the output of current transformers (CT) at 8 kHz to measure the current and voltage of each leg of the AC mains. The reference design can achieve high accuracy across a wide input current range (0.05–100 amps) and supports high sampling frequencies necessary for advanced power quality features such as individual harmonic analysis. Using an independent ADC to sample the CT output provides designers greater flexibility in the choice of metrology microcontrollers when compared to integrated SoCs and dedicated application-specific products. The reference design uses a SimpleLink™ ARM Cortex-M4 host microcontroller to calculate energy measurement parameters.

Both PCB footprints and schematic symbols are available for download in a vendor neutral format, which can then be exported to the leading EDA CAD/CAE design tools using the Ultra Librarian Reader. The reader is available as a (free download.).

The UL Reader is a subset of the Ultra Librarian toolset that can generate, import, and export components and their attributes in virtually any EDA CAD/CAE format.